454 build cam questions

[axattax]

hey, i am currently in the middle of a build and am curious on what cam i can use without having clearance issues. i currently have a 75' 454 2 bolt main bored .030 over with what i believe to be a stock crank turned .020 under both main and rod. i have speed pro .100 domed pistons with ported and polished matching heads dual valve springs and 1.72 ratio roller rockers. i am just curious what cam lift and duration i can run. im running this motor in a 79 chevy 1 ton for offroad use mostly. with the occasional mud drags and what not. any info would be much appreciated as most of my expierience is in john deere diesels

[Dave Severson]

I'd do the Comp Cams Cam Quest deal...it's a free download at Comp Cams. Whatever cam you go with, it's always a good idea to do the valve to piston clearance check with some clay, a feeler gauge, and checking springs....or, Wait till Pat is on here and he can tell you what will work, cuz he's probably built a couple dozen engines just like it!!!!!!

[pat mccarthy]

yep built many of them with out knowing how much been cut off the heads or deck or what size valve s your running its hard to say what will clear so a smaller cam is always a safe bet with a roller cam you can put more lift on them .but if your looking at a flat lifter cam .i would not use one for mud drags or in the pit i built and help in many of engines like this a hyd cam is not my first pick. Rpms can go to the moon valve train needs to be top noch with a hyd cam you can be in valve float EZ